Joseph kennedy



I. KENNEDY.

EXPANSION SHIELD APPLICATION FILED AUG-20.1917.

1,304,887. Patented May 27, 1919.

WLS I f( A 53 @I I 5 I d Y 'UI l I I I lu/wanten @I /Wf thereof in'appended claims.

i l UNirEn STATES PATENT omnes.

JOSEPH KENNEDY, OF RICHMOND HILL, NEW YORK, ASSIGN OR TO THE CLEMENTS C0., Y

OF NEW YORK, N. Y., A CORPORATION OF NEW YORK.`

To all 'whom t may concern:

Be it known that I, JOSEPH KENNEDY, a citizen of the -United States ofv America, and a resident of Richmond Hill, county of Queens, and State of New York, have invented certain new and useful Improvements in Expansion-Shields, of which. the following is aspecification, reference being had to the accompanying drawings, forming a part thereof.

My invention relates to bolt anchors and has special reference to such as are constructed of sheet or other deformable metal.

One object of my invention is to provide a simple device of the aforesaid character which may be manufactured in large quantities at small cost, and which' shall be especially rigid as compared with devices of the prior art constructed ofsheet metal or the like of substantially uniform thickness;

Another object is to provide a tapered expansion shield of metalof uniform thick- Vness but to provide excess metal at the part thereof of reduced external diameter, by having vrigid ribs or flanges, or ribs or fianges which are adapted to be folded or crushed Vby the expansion of the shield between the shield and the wall of the hole in which itis inserted, which ribs or flanges in either case provide the excess metal nec- Vessary for a good anchorage.

AnotherY object` of the invention is to lcrim or fold the metal of the shield inwar ly along substantially longitudinal lines in such a manner that the insertion of a bolt -will force these crimped or folded paiits outv'vardlyv so .that the Vmetalv of the shield will entirely or substantially surround the threads 4of.th'e bolt and to provide, by fianges vor folded ribs, excess `of metal at such crimped parts of the shield. ,K

l In Order that my invention may be thoroughly understood, I: willnow proceed to describe the same in the Yfollowing specification, and vthen 'pointout :the novel features This application is a continuation in of two copending applications for patents Serial Nos. 19,523 and 20,619, filedbyf me re'- spectively on the 6th and 12th days" of April',

Specification of Letters Patent.

EXPANSION-SHIELD.

Patented May 27, 1919.

Application filed August 20, 1917. Serial N o. 187,063.

Referring to the drawings: Figure 1 is a longitudinal sectional elevation of a bolt anchor made in accordance with and embodying my invention, shown 1n its expanded condition as utilized in holding a bolt or screw in a wall of concrete ork Y other material. The section .in this figureV is taken on the irregular line 1--1 of Fig. 2.

Fig. 2 is a transverse sectional elevation on an enlarged scale, of the parts shown in Fig. 1. v l Fig.. 3 is a plan view of a blank or stamplng from which the shield shown in Figs. 1, 2 6, is formed. g Fig. 4 is a Yplan. view, and

Fig. 5 is a side elevation of the. shieldr shown in Figs. 1 and 2 before expansion.

Fig. 6 is an end elevation of the same form of shield. Y

Figs. 7, 8 and 9 are end views of modifiedv forms of shields which also embody this in-r vention.

Fig. l0 is an end view cfa shield of still funther modified construction in whichV a greater excess of metal is provided vat the inner end of the shield.

Fig. 11 is an end view ofV aV shield whichV also embodies this invention, in which theV excess metal is provided by portions whichV are folded back upon the walls of theshield before the shield is expanded.

` Fig. 12 is a sectional end elevationof a form of'shield in which the folded portions which provide Vthe required excess of'rmetal are at otherv than rthe lines of division between the' expansion members of the shield.

Fig. 13 is an end elevation, of a form of my invention in whichA the shield isa circumferentially continuous tube.

bodying Vthis invention which is constructedy from. a blank bent'tra-nsversely into aygtube;`

Like characters of reference designate corresponding parts in all the figures.

which extends through a suitable hole inthe .Y

., 9`0 Fig. 14: is an end elevation of a shield em?.A

- 15 designates a wall of concrete, brick or which the bolt is screwed. This may be constructed of sheet metal by first cutting out a blank like that shown in Fig.. 3. As here shown this comprises a central body 21, and in this case two flaring side members 22 and 23 which project from the body 21. The blank is then formed in a die which makes the body 21 into a thimble and the side members into a tubular extension of the thimble. cut off to provide a clearance hole for the bolt at the outer end of the shield and transforms the thimble into a substantially cylin-A drical ring or yoke 24. Before this is done the edges of the side members are bent upwardly along some such lines as those indicated at 25 in Fig. 3 to form the outwardly curved ltapered flanges or ribs 26. The metal between the lines 25 is also corru-A gated 0n spiral lines to form in the finished shield, screw threads with which the threads of the bolt may engage. These corrugations as seen from the outside ofthe shield are designated 27.

At or near the vlineswhere the ribs or flanges 26 bend outwardly from the shield, the latter is bent inwardly or indented as at 28 along lines which taperv to the same extent with, but in the opposite direction to7 the taper' of the" ribs or flanges. This re sults in the t-ubez'being'cylindrical at vthe outer end and having its bore tapered towardthe inner end of the shield to a crosssection somewhat similar in form to that of an hour-glass, as seen in Fig. 6. 1t also results in the outer ends ofthe ribs or flanges' lying in an imaginary cylinder of the diameter of the ring or yoke 24.

Before specifically describing the devicesr shown in the other figures of the drawing, 1 will describe the operation of this form of my invention. Y

The shield is'inserted in the hole 16 which is drilled of a diameter to allow the ring 24 to lit. The'ribs or flanges 26 then serve to centralize the'shield in the hole.Y 'When a bolt is screwed into this shield it will force Vthe indentations 28 outwardly causing the inner part of the shield to assume a cylindricalv form which surrounds the threads of the bolt. The ribs or iianges 26 will during this operation be folded down onto the outside of the shield andl forced into the wall of the hole 'as shown in Fig. 27 and in the lower part of Fig. 1. These'ribs or i'ahges'pro; vide an excess 'of metal which increases to'- ward the inner end of the shield and thus 'the device forms a secure anchorage for the bolt. t

IThe Y indentations 2S which contract the inner. end'of the shield are shown as causing this contraction to give the inner end of the shield anhour-glass form of crosssection in Figs. 6-12, which is the case wheneverthere are'two of these indentatioir'rs diametrically The end of the thimble is then,

disposed. But where there are more than two of these indentations as at 28A, in Fig. 13, or 28B in Fig. 14, the form of crosssection of the inner end` of the shield is quite different but this does not materially change the operation or the function of the device.

In Fig. 7, the ribs or flanges 26A are similar to those shown in Fig. 6 but are not spread apart as in the latter figure.

The ribs or flanges 26B in Fig. 8 are bowed apart so that during expansion they are crushed together. But their function of centering the device before expansion and of providing excess metal` for anchorage pur poses', remains the same. v

Where a greater amount of excess metal is' desired the constructions shown in Figs. 9 or 10, may be used. In Fig. 9 the outwardly projecting tapered ribs 26C have their outer/'edges 29 bent around into the periphery ofthe imaginary cylinder projecting from the ring 24. In the construction illus'- trated in Fig, 10, the ribs or Vflanges BOlnot only diverge as in the form shown at 26 in Fig. 6., but are doubled back as at 81 and outl again as at 32 to form a greater amount of excess metal.

The form shown in Fig. 11 is added tol show that the inventionis not limited'to ribs or flanges which are folded by the expansion caused by the insertion of a bolt. In this case the ribs oriianges 33 are Jfolded down onto the outer surface of the shield during its manufacture. They may be tapered as in the other cases to correspond with the taper' of the indentations 28.

It is .not necessary of course that the ta*- pered indentations 28 are at the lines of separation betweenV the arms 22 and 23. of the blank. Fig. 12 shows the tapered indentations 28 midway between the lines of separation, and the ribs 34 formed by folding the metal together -a't or near these lines of indentation. y Y

Fig. 13 as I have statech showsV a device constructed of a. circumferentia'lly continuous tube which before the folded taperedV ribs 85 and indentations 28A were v made therein would be in theform of a truncated cone on account of the excess metal at its inner'end.

It is not necessary that the shields be conl structed in accord with the method which has been described. They may be madeV also by bending a blank transversely to form a. shield'which embodies this invention sucli` as that shown in Fig. 14. In this case there are four tapered indentations`28B opposite three of'which are rfolded ribs 36 andV opposite the other are a pair of lflanges 37 which perform the same function. Y y

Neither is it Iessential that the bore and ribs be tapered. 'When a tapered bore is.

desired it is not necessary that itbe formed during the manufacture of the device. If the bore is cylindrical in the finished device theribs or flanges will cause the bending inwardly or indenting of the shield to take place when the shield is driven into the hole which is to receive it. Tapering the ribs downwardly toward the inner end of the shield will facilitate this operation. After the shield is driven into a hole a bolt is inserted which, expanding the shield into tight engagement with the walls ofthe hole and forms a secure anchorage.

Vhile the bolt anchors of my invention may be readily formed from commercial sheet metal, such as sheet iron, steel or brass, having a substantially uniform thick-V ness, I have used the term sheet metal herein in a broader sense and intend to include not only what is known as 'sheet metal but also rolled metal such as lead, or cast or wrought metal, and malleable iron which is adapted to be shaped vto produce the desired form.

Various other modifications than those which I have shown and described may be effected within the spirit and scope of my invention, and I intend that only such limitations be imposed as are indicated in the appended claims. Y

What I claim is:

1. A bolt anchor comprising a substan said body.

2. A bolt anchor comprising a substantially circumferentially continuous tubular body adapted to receive the threads of a bolt, a plurality of tapered depressions therein reducing the bore of the tube toward the inner end thereof, and a plurality of oppositely tapered ribs to provide excess metal at the inner end of said body.

3. A bolt anchor comprising a substantially circumferentially continuous tubular body forming two expansion members divided from each other through at least a part of the length of the anchor, and adapted to receive the threads of a bolt, the adj acent edges of said members being bent outwardly and constructed yto form longitudinal ribs tapered to increase in height toward the inner end of the anchor, and mem'- bers having oppositely tapered depressions therein adjacent said ribs.

4. A bolt anchor comprising a substantially circumferentially continuous tubular' body adapted toreceivethethreads of a bolt, a pair of tapered depressions therein forming a bore varying in cross-section from' a circle to an hour-glass form from end to end, and oppositely tapered ribs adjacent said depressions to provide excess metal at the inner end of said body.'V

5. A bolt anchor comprising a substantially circumferentially continuous tubular body forming two expansion mem-bers divided from eachother through at least a part of the length of the anchor and adapted to receive the threads of a bolt, each of said members having ribs' yextending outwardly adjacent the plane of division between said members,` and`l inwardly'v` extending `tapered depressions adjacent to said ribs, forming a bore varying in cross-section from a circle to an hour-glass form from end to end.

6. A bolt anchor comprising a substantially vcircumferentially continuous tubular body adapted to receive the threads of a bolt, a tapered depression therein reducing the bore of the tube toward the inner end thereof, and an oppositely tapered rib to vprovide excess metal at the inner end of said body, said tube being arranged when expanded to surround the threads of a bolt.

7. A bolt anchor comprising a substantially circ'umferentially continuous tubular body adapted to receive the threads of a bolt, a plurality of tapered depressions therein reducing the bore of the tube toward the inner end thereof, and a plurality of oppositely tapered ribs to provide excess metal at the inner end of said body, said tube being arranged when expanded to surround the threads of a bolt.

8. A bolt anchor comprising a substantially circumferentially continuous tubular body o-f deformable metal adapted to receive the threads of a bolt, said body having a depression therein reducing the bore of the tube, the metal of said tube being folded vso near the line of said depression to provide an excess of metal at said part of the tube.

9. A bolt anchor comprising a substantially circumferentially continuous tubular body of deformable metal adapted to receive the threads of a bolt, said body being arranged to be bent.,inwardly toreduce its bore Ibefore a boltv is inserted therein, the metal of said tube being folded near said inwardly bent part of the tube to provide an excess of metal at said part of the tube.Y

l0. A bolt ancho-r comprising a substantially circumferentially continuous tubular body of deformable metal adapted to receive Athe threads of a bolt, said body being arranged to be bent inwardly along longitudinal lines to' reduce its bore before a bolt is inserted therein, the metal of said tube being folded near said lines to provide excess metal at said parts of the tube, said tube being arranged when expanded to surround the of a bolt. A

l1. A bolt anchor comprising a substantially circumferentially continuous tubular body ofvdefor'inable metal arrangedto be bent inwardly alongl longitudinallines to reduce its bore and to have a substantially cylindrical outer surfaoe before a bolt is inserted therein, the metal of said tube being folded near said lines to provide excess metal at seid parts of the tube, the inner surfaces of said tubular body being provided with substantially continuous corrugations adapted to receive the threads of a bolt, said tube being arranged When eX- panded to surround a bolt and to substan- 10 tially cireumferentially engage the threads thereof.

In witness whereof I have hereunto set my hand this 17th day of August, 1917.

JOSEPH KENNEDY. Witnesses:

I. B. MOORE, l/VILLIAM G. DALTON.

Copies of thispatent my be obtained for five cents each, by addressing the Commissioner of Patents, Washington, D. C. 

